Editor’s note: The FBI was tracking Martin Luther King up until the day he was assassinated.

A d v e r t i s e m e n t

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It started with a fingerprint of a 25-year-old college professor who opposed the Vietnam War and ended with a search for his remains, 32 years later, in a wooded area near Eveleth, Minn.

The FBI’s files on Paul and Sheila Wellstone, many of which are being made public for the first time, shed new light on the extent of the relationship between the FBI and the political activist who would go on to become a U.S. senator from Minnesota.